COSMOGAS MYDENS, Installation, Use And Maintenance Manual

Page: 57 / 76

57 MYDENS
COSMOGAS
8 - MAINTENANCE
Figure 8.3 - positioning the electrodes on the
burner
Figure 8.4 - Access to the expansion tank
C
B
A
E
D
020002.01.025
8.5 - Correct positioning of the
ignition and ionising electrodes
For good working order of the appliance, it is indispensable
that the electrodes are positioned correctly (refer to figure
8.3):
- the distance between the ignition electrodes “A” and “B”,
must be between 2.0 and 2.5 mm;
- the distance between the ignition electrodes from the burner
surface must be between 5 and 5.5 mm;
- the distance of the ionisation electrode from the surface of
the burner must be between 5.5 and 6.5 mm.
8.6 - Controlling the expansion tank
The expansion tank is positioned in the left side of the
boiler.
Check the pre-fill pressure of the expansion vessel. It must
be at 1 bar. If the pressure is lower, restore it, allowing the
water to evacuate from one of the two central heating drain
cocks (details “A” and “B” in figure 8.16).
If the replacement of the tan becomes indispensable,
proceed as follows to remove it (refer to figure 8.4 when not
differently specified):
1.- access the boiler internal components following chapter
8.2;
2.- empty the central heating circuit, following the procedure
in chapter 8.16;
3.- remove the screw “B”;
4.- loosen the fitting “C”;
5.- extract the expansion tank “D” towards the front.
6 - Replace the tank.